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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43cef946ac6b1754c4da73a8d112eec10df627998d7d8c08d42d1676a13ba955' 
  AND token = 'TUqcWJ4XBWIqK90gTdEmMHw7BiT4hWjtD7V1ZGM2N74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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