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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b478e76205a69bc67de2cf6cbc87767bab4a55e4ffb0a61b1038b9d083d53c7' 
  AND token = 'bbAQeLkhZyuMSDeKcE7CntBXSsf7UCR/UGshiAqxuxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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