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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '895e08b4a5bb8f06dc23035429b8e86061bf64204db80963a549fbace164bd4a' 
  AND token = '0b/mT+Szr6xliXVZ8+mXaq44xSGzBe1IhwGO+IXs2m8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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