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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec6dca62d6e785b77081212d94165ad391a1b5258ffa7a86f4de9f6413b55ef5' 
  AND token = 'mIzZkYubnkxkN6rqKe//bF3BoJQV5bmm7tg8TQ06kHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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