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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9193c6aad9df3fcc9e2d9aa9468923a61152626d7888200a5eebc421eba68e4' 
  AND token = 'kH/ytjxPktAF0vnB1krMPy08NipJVcXHMjqLwBjL6zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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