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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1cf269b01d010e593fd69d59d9b929cb4bdb7618bf177ca39c78cf828d87796' 
  AND token = 'nY1GonNOS8Y4vmwengo2Ui3TYnndzmLn1gltmiUXELs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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