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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89c78518293bbba6903408af2cde756b86e99b61f6715c380fe221fbf299bd88' 
  AND token = '+uNq1HFREh3T8bcGjD9XF3fVRPZ+PX/8zvHC8jof8zQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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