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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8ebd3e29c71baf1245eddc6379d5cba51397eb097b1a4b663cda30a505dce7e' 
  AND token = '1gtbgyNpL0UVnDnSspWku8tPlm//MNz/DPIFKAvcawc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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