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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d6698af003ef9d1c7737b08ebae2b030f2417f42c4ab0b032ce407c5e713e99' 
  AND token = 'jlSBSFC1j/LNUii8xMa+PjUaskUfBeWVMsxTzwFzQoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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