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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bfa6f5766e515eea4f3f07748c9230c2ec0edfc3bff19151e5dc271c7b830fc' 
  AND token = 'o6z9nF1p/IrcWMn+rFrxWqfn8PGcKTGNkoyHHDBPcwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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