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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec9550b4ddc334a0dd11eca637097ab7aeaf1366062d8eb97b8da43e8513d96d' 
  AND token = '7/rShADgDj9Hrcbah3yEMOt5PFilHf3vDiglWmnB2vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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