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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd69781143a960b94c51224bf7397019c8f87d65978bd286d4d3e984e88154cbc' 
  AND token = 'wAQUO7pMbzQNg7iHvIh/ER9YcrD/IOvahIuh3XYbdns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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