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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faf7c075ee967fb604b1b85de72cb206baa63ee78d246d6f2b952c10b55968ea' 
  AND token = 'ar5SuM0bA4U4rtXDOFxMT7aq6z6e80eZnQEtKt182/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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