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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57fe7a99e04d4dccba81c6061a9c67ef4d062c38dabc83b309688a243d4101d7' 
  AND token = 'D/kwlHNyj/0s+fREbrY8MFVolkRg+Rp0lkDdE2NbMUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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