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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b727fad2794f05f00aac71e5a2b3e02d540ea3c4a790280bf612ebe60ae6f1b' 
  AND token = 'KA5ojMMMBj2rGXDxa2qWR19FtGDRGimaqa6Nta5875s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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