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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29ee42a677442957ffa22bdcba69d9837256ddfc17e449db15db5b63b5b06951' 
  AND token = 'cvCTP6pr+DjP5xtJCceIa6+Evgr68u5uzXY35pySH+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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