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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08abca7fb0f185207c7aaa1b4fe4c3154563518a312ea8690881663a04a94120' 
  AND token = 'Jx+fIfks66XBY5exTJ8XHekp0zUynhYr069h/3t5PzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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