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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6015644c84753b767cb08225225072c65b04bf92a8793d15e3b5cab3b609f9ea' 
  AND token = '/n/iF1oZYj34TVpc9kSYov3p3o4yUgSDducxalYSYl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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