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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d9d33c7a73b7c4b8e841a99867d9bc2b0ca9bdb3b31ff0a3683f268c020c9c3' 
  AND token = '6lphPh4/ck2qVpnTiD4yUkTcYmmF1LY1WhETvfu/Mm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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