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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69ce06acb6d6c4055b524478121da6812e2532ea46cb557cf971d300d21b1049' 
  AND token = '+sugyuzV3x9LfxkrpKOypkpDQGJpb8rt10MZPJDzbV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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