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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd79637035a35f036d5c743a845654b6531e6c80482ec23fb1fe0d81f206c3725' 
  AND token = 'E3lbL5GCq/7VDDWT+U9sJiflCTQyh0GvAdPiLEd1VX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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