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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60fe709a09c483d8b3e970c104c6c9874cd3ba811e615a66c52b2f7518cfbb5d' 
  AND token = 'ScwwENg2Dl6Njmzz2tVayo/5lQlWGkbLyoAwnpLk5hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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