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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84bbab675c66ccf2b7cc61d93b25a4bd343bfb0bafd2b2980cc1d460944a5cb5' 
  AND token = '9mR1+lXKhV4lwO4KHg/emupCjnSMi2bj9sssXWGCI8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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