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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e6cfb8e906c8d5ae50fd334943b10033fa2d120582c91849b8154bddb6d81d1' 
  AND token = 'rQ8opcfBUvKoK1D2d5jNl1Exuncbnc6i81k5tdPT/pY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}