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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f53d3a7e30bc89e72234aed883d4b7ed304f413adaefc44a5dbc3591a3b0f19c' 
  AND token = '7n2Y7UC/NN6mFuIuVToU6Jfc0Qair2odZ+OsWszgf7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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