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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbe25592caff8c4bf4585fc2d3bc1c198b90bf0c227d74a6ce26c12bf5a39ecb' 
  AND token = 'M6MIwUi0TC5Pp5jGvuhFU0ryryDpbhoNYY1d6LVMjCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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