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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b8466389d74cfc97a346e86aed43c3987254610c26ff6468f626b9ff8b98e4e' 
  AND token = 'A4V9Pylu3fWu8HOVuHeTj4doDJ95oHmjNN/poLknJk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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