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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e904322d0523f511d987b0317596f911e94da904673a742c1f4d675d548dce1e' 
  AND token = 'XC4wIq6Bw9OQX+TLRQNnt2ONXdhuaGaMeD9Oq2cVH0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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