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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c25c667b657e94e273af5c91b281001deb4bd7c4073298db67ac8285f86562d9' 
  AND token = 'AS3YVTXDmOxi7WdYrdmKDZxz+pVYMy+z8qLQCOfcr58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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