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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60d9bdaa8c783877f76b9939196d74bcc051ffa6b51470d0dd30956324459621' 
  AND token = 'jrCqR3uB7xyefTi2LFsaLkhDIBctGZwL7PcL41mey1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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