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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a835ea5e6d373ac9f5f67d5313ae3c36ed49b573ce54768f6d0e282933cb9e5' 
  AND token = 'SO4MkzenGUUDOvgkyPUHPKgjDCqauEQcyR2zsKOKRHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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