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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef3b5b53038f1b52f726d0be13c625b84714e23a6b305db1c3ca1c6a9ccbeae6' 
  AND token = 'YWw5uJtFcmphqAw6q71cdRBeIlLxu3EF/Ig5qGD7qjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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