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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a013f4d0b81314ae8aea8f6fe55aa96d53843691e27504efdc68acf7f78dd121' 
  AND token = 'nAbye/MKwGgMJxEIv+R9pqwqnNtM1JH36rHrY7t7YZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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