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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf0da20f7fc45db3c821344e2a6f117b545a7ddc85f717430c6cd983357a37c2' 
  AND token = 'VbCfS5oQoEzT2UfKdR9S5y7GpJsjwXdqTrYPIB5dwto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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