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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e24dbb931f17d8eff09de25b7cf443d52209d4bc8bc8f82b28007d9fd9e402f6' 
  AND token = 'uiGUdCeiZxVNWmvoZEG+7oqt+tRG3GJj8/3FzsFuh00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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