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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e675dfdf63f801e3725d95760fcda24380e88d4a6835aba868829629f647647e' 
  AND token = 'APYDrsTs9DFC9L9EyShaeWJQ8iswcXKy8WkI0Naac8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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