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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fac55f39097ddf6ffb0554fd65e5efc26b680bb16feafca59577d53ca0130efd' 
  AND token = 'HcnPW+dVYdnXzXgSwLmL4lxGZbhosu1D0cWfkQjQnPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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