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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ac3b9102373fdb1ad219fa5f57c9e189916ab8589c65a68901b8a51e0401f58' 
  AND token = 'Aeg8FTnWRC2m8XP1qg4psw4vT/oqrPM9NrBiILlKgJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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