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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a031f93ee3597aa3904f4c23b1e5887bcadc4504a209fa6839e73705bbfc9d7' 
  AND token = 'Aby3ZoPl2tlDij/H7qW8mOSl6NeD+dL218sWUJo4gw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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