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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d50d423a4bbb58959db7312f3b2e9a18b018a9b9b36e211b4f9a8cba44af674' 
  AND token = 'bxx6izQOIJ9Q4wwQpsYfV3zkP3yVmuweXcGrv9hXiug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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