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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aa65f7a113f361cc830e23c903322d89ae139ffe1a4ae8bf9d10872e48ce18d' 
  AND token = 'VeuXQVSTMk7KRZjaeK5wETuOOnakHFgxnpYIqT7/MCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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