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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6e009e39ab8ef47a83a4b3ed09969258bb59d19781b06813f800bebafb40820' 
  AND token = '80hYbMTi3R7QU2vZGRaGVLC2c/BwmEZZhAjLmQf+16Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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