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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb6834055c5f59a50bf4e381092c41700328fdd93b2bfd2f573b61ae0ebf5e24' 
  AND token = '6VrWHuGdPW2RaVjmL/S4mxCK2xKGDiuFz2WcuPLhH+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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