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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce413b02809303a997758c232114d2dc549f3fc4755256e1da899cadeac5fd3b' 
  AND token = 'XivWTfd90Pqb9pM96MxZ/V1IelYHATXGjObhbXQOKvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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