SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da900e28637af1955458895ec3063dd3835860a12e36e41e86ec5c82d29b1f00' 
  AND token = '2u+yZG+3RqpWGUCU60SYgrITL/J8n8KD5UvClkVo/ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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