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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab448eb721af4e622993f94e669288f4cf30b41db192f220b62e7a6ffaf558ad' 
  AND token = 'At0UchJZow4QQsSbwQFvGezJSEoLt7Ia4fxihsEdwTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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