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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88c460b68d5fbf566eb32e9618aea194b3501df518f7b77ea75be4d034feebe6' 
  AND token = 'APOZ1XcPi6TeibZwGf86OF75NRkBgP8H//kyT/NJVAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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