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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47c62dae9910fb7e6cc5971fbfd24bbd5f9c3c88125ee941f82a89cfbe94becf' 
  AND token = 'jEznA10r7wgcEAK7YX9obzckKi1JvD2EeAbNkWyocRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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