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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28200f6fc07da80a4c0468bd710957e26569bf08b5d10ee40ab446253bc8c560' 
  AND token = 'KoS5RPIjiTudUtZySo3thpeGoYDkcbxrjDvsRfbRHC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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