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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '570d29e1e3438af76d4abf17c99335831631bfdbf7c7ff545b91fa344361da9e' 
  AND token = 'pSIWP7xWQ18aq9yYiQv4Nw4HWv+0AWPdt7+JJbqkA54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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