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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e28d742a0087e96c6afc77eb02b11e2de600188bf4ae520b6269029a600315ff' 
  AND token = 'wVw1ZNwiCvw02A9pESbPC5MmhUKdWePHFGbmUaYr6/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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