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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd19a2119929539e54b3fcce0d15d26f23a7b71481704dca5b8140787d044e78d' 
  AND token = 'UuxVDfqMidECwACHPpzFw39g2hcSdt8XPKg17vWRzMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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