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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adddff940bcf4b7e35ac4b46c4615afada0ac911b1e08fdaa989d2a36db72b29' 
  AND token = 'GCAe4bHYENCi8+AKDGLIGIkKjHwWoHM/74/QlGMM5gY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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