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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae7863898e6cdd92bb69aad61b6c5736c9c88695a34dcf07b9aa8ffb8268f5e4' 
  AND token = 'EpD21Z13ZVv5nq4VEtIT6yrJDnZae1n/oazu1c4Ki3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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