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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c13f5899f2987a4d06a8de252f92ce94efec8931df7d520303096ec4e8983df' 
  AND token = 'fdFjnCpEDRudcOilQxze2W6WKzWF/v19FKbezTHMLQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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